Kubernetes配置flannel网络

操作环境

网络拓扑图

操作步骤

配置k8s-master

1.在k8s-master节点上创建flannel网络

[root@k8s-master yaml]# etcdctl mk /atomic.io/network/config '{"Network": "172.17.0.0/16"}'

2.配置flannel

1. [root@k8s-master yaml]# vi /etc/sysconfig/flanneld
2. # Flanneld configuration options
4. # etcd url location. Point this to the server where etcd runs
5. FLANNEL_ETCD_ENDPOINTS="http://10.10.200.224:2379"
7. # etcd config key. This is the configuration key that flannel queries
8. # For address range assignment
9. FLANNEL_ETCD_PREFIX="/atomic.io/network"
10. #FLANNEL_ETCD_PREFIX="/k8s/network"
11. # Any additional options that you want to pass
12. #FLANNEL_OPTIONS="ens192"

1. [root@k8s-master yaml]# vi /usr/lib/systemd/system/flanneld.service
2. [Unit]
3. Description=Flanneld overlay address etcd agent
4. After=network.target
5. After=network-online.target
6. Wants=network-online.target
7. After=etcd.service
8. Before=docker.service
9. [Service]
10. Type=notify
11. EnvironmentFile=/etc/sysconfig/flanneld
12. EnvironmentFile=-/etc/sysconfig/docker-network
13. #ExecStart=/usr/bin/flanneld-start $FLANNEL_OPTIONS
14. ExecStart=/usr/bin/flanneld -etcd-endpoints=http://10.10.200.224:2379
15. ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker
16. Restart=on-failure
17. [Install]
18. WantedBy=multi-user.target
19. RequiredBy=docker.service

3.启动flannel

[root@k8s-master ~]# systemctl start flanneld.service 

在启动flannel，通过ifconfig可以查看到flannel0

1. [root@k8s-master ~]# ifconfig
2. ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
3. inet 10.10.200.224 netmask 255.255.255.0 broadcast 10.10.200.255
4. inet6 fe80::ec55:e4e8:4be:93bb prefixlen 64 scopeid 0x20<link>
5. ether 00:0c:29:18:3f:c3 txqueuelen 1000 (Ethernet)
6. RX packets 147042 bytes 44436790 (42.3 MiB)
7. RX errors 0 dropped 30 overruns 0 frame 0
8. TX packets 148062 bytes 33065150 (31.5 MiB)
9. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
10. flannel0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1472
11. inet 172.17.30.0 netmask 255.255.0.0 destination 172.17.30.0
12. inet6 fe80::3908:159:b907:1624 prefixlen 64 scopeid 0x20<link>
13. unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC)
14. RX packets 1321 bytes 1737235 (1.6 MiB)
15. RX errors 0 dropped 0 overruns 0 frame 0
16. TX packets 630 bytes 58891 (57.5 KiB)
17. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
18. lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
19. inet 127.0.0.1 netmask 255.0.0.0
20. inet6 ::1 prefixlen 128 scopeid 0x10<host>
21. loop txqueuelen 1 (Local Loopback)
22. RX packets 64441 bytes 28164690 (26.8 MiB)
23. RX errors 0 dropped 0 overruns 0 frame 0
24. TX packets 64441 bytes 28164690 (26.8 MiB)
25. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

配置k8s-node

1.2个节点flannel的方法相同，配置flannel

1. [root@k8s-node1 ~]# vi /etc/sysconfig/flanneld
2. # Flanneld configuration options
4. # etcd url location. Point this to the server where etcd runs
5. FLANNEL_ETCD_ENDPOINTS="http://10.10.200.224:2379"
7. # etcd config key. This is the configuration key that flannel queries
8. # For address range assignment
9. FLANNEL_ETCD_PREFIX="/atomic.io/network"
10. #FLANNEL_ETCD_PREFIX="/k8s/network"
11. # Any additional options that you want to pass
12. #FLANNEL_OPTIONS="ens192"
13. [root@k8s-master yaml]# vi /usr/lib/systemd/system/flanneld.service
14. [Unit]
15. Description=Flanneld overlay address etcd agent
16. After=network.target
17. After=network-online.target
18. Wants=network-online.target
19. After=etcd.service
20. Before=docker.service
22. [Service]
23. Type=notify
24. EnvironmentFile=/etc/sysconfig/flanneld
25. EnvironmentFile=-/etc/sysconfig/docker-network
26. #ExecStart=/usr/bin/flanneld-start $FLANNEL_OPTIONS
27. ExecStart=/usr/bin/flanneld -etcd-endpoints=http://10.10.200.224:2379
28. ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker
29. Restart=on-failure
31. [Install]
32. WantedBy=multi-user.target
33. RequiredBy=docker.service

2.启动flannel

[root@k8s-node1 ~]# systemctl start flanneld.service

3.启动flannel后，可以通过ifconfig查看到flannel0

1. [root@k8s-node1 ~]# ifconfig
2. docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1472
3. inet 172.17.23.1 netmask 255.255.255.0 broadcast 0.0.0.0
4. inet6 fe80::42:a5ff:fef4:9795 prefixlen 64 scopeid 0x20<link>
5. ether 02:42:a5:f4:97:95 txqueuelen 0 (Ethernet)
6. RX packets 1430 bytes 1851730 (1.7 MiB)
7. RX errors 0 dropped 0 overruns 0 frame 0
8. TX packets 1490 bytes 1290056 (1.2 MiB)
9. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
11. ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
12. inet 10.10.200.229 netmask 255.255.255.0 broadcast 10.10.200.255
13. inet6 fe80::5834:2493:e9ef:3b95 prefixlen 64 scopeid 0x20<link>
14. ether 00:0c:29:f6:c6:42 txqueuelen 1000 (Ethernet)
15. RX packets 264090 bytes 41537991 (39.6 MiB)
16. RX errors 0 dropped 19 overruns 0 frame 0
17. TX packets 251049 bytes 64982214 (61.9 MiB)
18. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
20. flannel0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1472
21. inet 172.17.23.0 netmask 255.255.0.0 destination 172.17.23.0
22. inet6 fe80::da8b:b01f:3f46:3352 prefixlen 64 scopeid 0x20<link>
23. unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC)
24. RX packets 616 bytes 58064 (56.7 KiB)
25. RX errors 0 dropped 0 overruns 0 frame 0
26. TX packets 1315 bytes 1736045 (1.6 MiB)
27. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
29. lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
30. inet 127.0.0.1 netmask 255.0.0.0
31. inet6 ::1 prefixlen 128 scopeid 0x10<host>
32. loop txqueuelen 1 (Local Loopback)
33. RX packets 438 bytes 23836 (23.2 KiB)
34. RX errors 0 dropped 0 overruns 0 frame 0
35. TX packets 438 bytes 23836 (23.2 KiB)
36. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

4.设置docker0的ip地址

[root@k8s-node1 ~]# ifconfig docker0 172.17.23.1

5.节点2参照上述配置进行设置即可

通过上述就完成了配置flannel

参考文章

https://www.kubernetes.org.cn/3682.html